CIRAD, UMR082 LSTM, TA A-82/J, Campus International de Baillarguet, 34398 Cedex 5, Montpellier, France.
Koniambo Nickel SAS, Vavouto, BP 679, 98860, Koné, New Caledonia.
Microb Ecol. 2018 Nov;76(4):964-975. doi: 10.1007/s00248-018-1193-1. Epub 2018 May 1.
This study aims to characterize the ectomycorrhizal (ECM) communities associated with Acacia spirorbis, a legume tree widely spread in New Caledonia that spontaneously grows on contrasted edaphic constraints, i.e. calcareous, ferralitic and volcano-sedimentary soils. Soil geochemical parameters and diversity of ECM communities were assessed in 12 sites representative of the three mains categories of soils. The ectomycorrhizal status of Acacia spirorbis was confirmed in all studied soils, with a fungal community dominated at 92% by Basidiomycota, mostly represented by/tomentella-thelephora (27.6%), /boletus (15.8%), /sebacina (10.5%), /russula-lactarius (10.5%) and /pisolithus-scleroderma (7.9%) lineages. The diversity and the proportion of the ECM lineages were similar for the ferralitic and volcano-sedimentary soils but significantly different for the calcareous soils. These differences in the distribution of the ECM communities were statistically correlated with pH, Ca, P and Al in the calcareous soils and with Co in the ferralitic soils. Altogether, these data suggest a high capacity of A. spirorbis to form ECM symbioses with a large spectrum of fungi regardless the soil categories with contrasted edaphic parameters.
本研究旨在描述广泛分布于新喀里多尼亚的豆科植物螺旋角豆（Acacia spirorbis）的外生菌根（ECM）群落特征。该树种可在钙质、铁质和火山沉积土壤等具有显著土壤特性差异的生境中自然生长。本研究在 12 个具有代表性的地点对 ECM 群落的土壤地球化学参数和多样性进行了评估。结果表明，在所有研究的土壤中，螺旋角豆均与 ECM 真菌建立了共生关系，92%的共生真菌为担子菌门，其中以 /tomentella-thelephora（27.6%）、/boletus（15.8%）、/sebacina（10.5%）、/russula-lactarius（10.5%）和 /pisolithus-scleroderma（7.9%）为优势菌属。铁质和火山沉积土壤中的 ECM 菌属多样性和比例相似，但钙质土壤中的 ECM 菌属分布存在显著差异。这些 ECM 群落分布的差异与钙质土壤中的 pH 值、Ca、P 和 Al 以及铁质土壤中的 Co 呈统计学相关。总之，这些数据表明，螺旋角豆具有与多种真菌形成 ECM 共生关系的高能力，而不论土壤类别和土壤特性如何。
